当前位置:
X-MOL 学术
›
Adv. Opt. Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Geometrical Engineering of Giant Optical Dichroism in Rippled MoS2 Nanosheets
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-11-18 , DOI: 10.1002/adom.202001408 Carlo Mennucci 1 , Andrea Mazzanti 2 , Christian Martella 3 , Alessio Lamperti 2 , Mukul Bhatnagar 1 , Roberto Lo Savio 1 , Luca Repetto 1 , Andrea Camellini 4 , Margherita Zavelani‐Rossi 4, 5 , Alessandro Molle 2 , Francesco Buatier de Mongeot 1 , Giuseppe Della Valle 2, 5
Advanced Optical Materials ( IF 9 ) Pub Date : 2020-11-18 , DOI: 10.1002/adom.202001408 Carlo Mennucci 1 , Andrea Mazzanti 2 , Christian Martella 3 , Alessio Lamperti 2 , Mukul Bhatnagar 1 , Roberto Lo Savio 1 , Luca Repetto 1 , Andrea Camellini 4 , Margherita Zavelani‐Rossi 4, 5 , Alessandro Molle 2 , Francesco Buatier de Mongeot 1 , Giuseppe Della Valle 2, 5
Affiliation
A cost effective method to tailor the optical response of large‐area nanosheets of 2D materials is described. A reduced effective metalayer model is introduced to capture the key‐role of the out‐of‐plane component of the dielectric tensor. Such a model indicates that the optical extinction of 2D materials can be strongly altered by controlling the geometry at the local (i.e., subwavelength) scale. In particular, a giant linear optical dichroism at normal incidence is demonstrated, with major features around the excitonic peaks, that can be tailored by acting on the average curvature and slope of the nanosheets. The approach is experimentally demonstrated in few‐layer MoS2 grown by chemical vapor deposition on cm‐scale anisotropic nanopatterned substrates prepared by a self‐assembling technique, based on defocused ion beam sputtering. Major variations in the photoluminescence spectrum as a function of the average curvature and slope are also revealed. A full‐vectorial numerical study beyond the effective metalayer model and comprising strain effects induced by the geometry turns out to be consistent with such a complex scenario. The results demonstrate that the extrinsic geometrical engineering definitely opens viable way to tailor the optical properties and modulate bandgap of low dimensional materials.
中文翻译:
MoS2纳米片中巨光学二向色性的几何工程
描述了一种定制2D材料大面积纳米片光学响应的经济有效方法。引入了一个有效的简化元层模型来捕获介电张量平面外分量的关键角色。这样的模型表明,可以通过控制局部(即亚波长)尺度的几何形状来强烈改变2D材料的光学消光。特别是,证明了在垂直入射时具有巨大的线性光学二向色性,在激子峰附近具有主要特征,可以通过作用于纳米片的平均曲率和斜率来进行定制。在几层MoS 2中通过实验证明了该方法通过自组装技术基于散焦离子束溅射制备的厘米级各向异性纳米图案化基底上的化学气相沉积法生长。还揭示了光致发光光谱中作为平均曲率和斜率的函数的主要变化。整个有效的数值研究超出了有效的亚层模型,并且包含了由几何形状引起的应变效应,这与这种复杂的情况是一致的。结果表明,外在的几何工程无疑为定制光学特性和调节低维材料的带隙提供了可行的方法。
更新日期:2021-01-18
中文翻译:
MoS2纳米片中巨光学二向色性的几何工程
描述了一种定制2D材料大面积纳米片光学响应的经济有效方法。引入了一个有效的简化元层模型来捕获介电张量平面外分量的关键角色。这样的模型表明,可以通过控制局部(即亚波长)尺度的几何形状来强烈改变2D材料的光学消光。特别是,证明了在垂直入射时具有巨大的线性光学二向色性,在激子峰附近具有主要特征,可以通过作用于纳米片的平均曲率和斜率来进行定制。在几层MoS 2中通过实验证明了该方法通过自组装技术基于散焦离子束溅射制备的厘米级各向异性纳米图案化基底上的化学气相沉积法生长。还揭示了光致发光光谱中作为平均曲率和斜率的函数的主要变化。整个有效的数值研究超出了有效的亚层模型,并且包含了由几何形状引起的应变效应,这与这种复杂的情况是一致的。结果表明,外在的几何工程无疑为定制光学特性和调节低维材料的带隙提供了可行的方法。